NGC/IC Project Restoration Effort

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NGC4397

 

Basic Information


Location and Magnitude


Right Ascension: 12:25:58.2
Declination: +18:18:6
Constellation: COM
Visual Magnitude:

Historic Information


Discoverer: Tempel
Year of discovery: 1877
Discovery aperture: 11.0

Observational


Summary description: vF, S, II 55 sp
Sub-type: *3

Corwin's Notes

===== NGC 4397 is an asterism of three stars, located where Tempel saw it, "... 5 seconds following, 6 arcminutes north of II 55 [N4394]." I had earlier called this an asterism of four stars, but I now (April 2015) see only three on the DSS1, DSS2, and SDSS images. (The SDSS actually shows a fourth, but it is an extremely faint red star, perhaps seen just above the plate limit of the DSS2R. It certainly would not figure in Tempel's object.) Another apparent asterism exists another three arcmin to the north -- but only on the POSS1 red plate and, therefore, on the DSS. It looked real enough to fool me, but Malcolm caught it. My thanks to him for letting me know about my mistake.